Sound

I. What is Sound? A. The energy from a _______ carried in a wave. 1. ALL sounds begin with a vibration… Vibrating Strings Vibrating Voice Vibrating Ear Buds Vibrating Chirp

Non-Vibrating Tuning Fork 2. The vibration pushes on the surrounding air molecules a. This area is called a “_________________” b. The spread out area after the compression is called a “______________.” Non-Vibrating Tuning Fork compression Compressions rarefaction Rarefactions

II. Characteristics of Sound A. Sound waves have a wavelength 1. __________ = distance between compressions 1-wave

High Frequency Clarinet B. Sound frequency (waves per second) affects the pitch 1. Long Wavelength ___ frequency Low pitch 2. Short Wavelength ____ frequency High pitch Low Frequency Tuba High Frequency Clarinet

Material Dry Air 343 767 Water 1,483 3317 Glass 5,640 12,616 Steel C. Sound is FAST! 1. How Fast Is It? a. That depends on what it’s travelling through Material Speed (m/s) Speed (mi/hr) Dry Air 343 767 Water 1,483 3317 Glass 5,640 12,616 Steel 5,940 13,287 Speed (mi/s) 0.2 0.9 3.5 3.7 b. Sound is faster through _____ air than ____ air because the air molecules are moving faster.